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‘Thirsty’ ChatGPT uses four times more water than previously thought (www.thetimes.com)

submitted 3 days ago by cyrano@lemmy.dbzer0.com to c/technology@lemmy.world

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Writing a 100-word email using ChatGPT (GPT-4, latest model) consumes 1 x 500ml bottle of water It uses 140Wh of energy, enough for 7 full charges of an iPhone Pro Max

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[–] vinnymac@lemmy.world 29 points 3 days ago (5 children)

Why does the article make it sound like cooling a data center results in constant water loss? Is this not a closed loop system?

I’m imagining a giant reservoir heat sink that runs throughout a complex to pull heat out of the surrounding environment where some liquid evaporates and needs to be replenished. But first of all we have more efficient liquid coolants, and second that would be a very lazy solution.

I wonder if they’ve considered geothermal for new data centers. You can run a geothermal loop in reverse and use the earth as a giant heat sink. It’s not water in the loop, it’s refrigerant, and it only needs to be replaced when you find the efficiency dropping, which can take decades.

[–] DarkCloud@lemmy.world 11 points 3 days ago

It is a closed loop, but the paper treats it as if it's an open loop, and counts all water use for the building, as well as all the water that went into creating any equipment used.... and the water that escapes power plants in powering the buildings.... it also includes any other buildings that might house related services. Here is the original "study" which is about what maths could be done given the above assumptions:

http://arxiv.org/pdf/2304.03271

In short, it has nothing to do with reality, and is more just an attempt at the authors to get their names out there (on bad science that the media is interested in publicizing for click bait reasons).

[–] Munkisquisher@lemmy.nz 13 points 3 days ago

Evaporative coolers save a ton of energy compared to refrigerator cycle closed loop systems. Like a swamp cooler, the hot liquid that comes from cooling the server is exposed to the atmosphere and enough evaporates off to cool the liquid by a decent percentage, then it's refrigerated before going back into the servers.

Data centre near me is using it and the fire service is used to be being called by people concerned the huge clouds of water vapor are smoke

[–] TheGrandNagus@lemmy.world 17 points 3 days ago (1 children)

Yes, the vast majority are closed loop systems and the water isn't really used up, like a lot of these headlines imply.

That's not to say the energy being used can't be put to better uses, though.

[–] BrianTheeBiscuiteer@lemmy.world 12 points 3 days ago (2 children)

Not used up per se but sequestered. It's water that nobody will ever get to drink or use for crops, etc.

[–] todd_bonzalez@lemm.ee 12 points 3 days ago

The math on this doesn't really check out. The USA uses 322 billion gallons of fresh water per day. A hyperscale datacenter uses only 5 million gallons per day.

There are about 1,000 hyperscale datacenters in the USA, so that comes out to 5 billion gallons of water every day.

That's 1.5% of our annual freshwater usage, half of which is in closed loop systems and not going anywhere, and the other half being returned to the atmosphere where it will rain back down as fresh water again.

And of course, the water cycle doesn't really care about national borders or annual evaporation rates so much, and there is about 1 quintillion gallons of liquid fresh water available worldwide, so its not like sequestering 5 million gallons really offsets the available freshwater needed for hydration and agriculture.

[–] Hubi@feddit.org 3 points 3 days ago (1 children)

It could be used for other things like district heating at least.

[–] catloaf@lemm.ee 4 points 3 days ago

Datacenters are usually not located where this would be useful. They're placed where space and energy are cheap, because everything they do only needs Internet access. At most they'd heat the rest of the building for whatever office space there is.

[–] JPAKx4@lemmy.blahaj.zone 8 points 3 days ago (1 children)

It highly depends on every data center, but it is very likely that they do use municipal water for cooling. Mainting a Reservoir is extremely expensive for the amount of thermal mass it requires, these things kick off HEAT.

[–] bobs_monkey@lemm.ee 3 points 3 days ago (1 children)

I don't know why they aren't using reclaimed water from treatment plants. I don't see why potable water is necessary as long as the substitute isn't corrosive, but I might be missing something here.

[–] catloaf@lemm.ee 3 points 3 days ago

You'd have to get the gray water in, and it's more efficient to just continue treating it and using the municipal water system.

[–] someguy3@lemmy.world 5 points 3 days ago (1 children)

You can run a geothermal loop in reverse and use the earth as a giant heat sink.

You need something to move the heat away, like water or air. Having something solid that just absorbs will reach its heat capacity pretty quick.